(38 mixed standard solutions - potassium, sodium, calcium, magnesium, iron, aluminum, zinc, barium, lithium, strontium, manganese, copper, chromium, cobalt, vanadium, boron, cadmium, lead, selenium, nickel, arsenic, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, beryllium K, NA, CA, MG, FE, AL, ZN, BA, LI, SR, MN, CU, CR, CO, V, B, CD, PB, SE, NI, AS, SC, Y, LA, CE, PR, ND, SM, EU, GD, TB, DY, HO, ER, TM, YB, LU, BE / Medium: 10% nitric acid + TR. hydrochloric acid)